#define _DEFAULT_SOURCE
#include "apue.h"

static void sig_usr(int);
int main(void) {
    if (signal(SIGUSR1, sig_usr) == SIG_ERR)
        err_sys("cant catch SIGUSR1");
    if (signal(SIGUSR2, sig_usr) == SIG_ERR)
        err_sys("cant catch SIGUSR2");
    for (;;)
        pause();
    exit(0);
}

static void sig_usr(int signo) {
    if (signo == SIGUSR1)
        printf("received SIGUSR1\n");
    else if (signo == SIGUSR2)
        printf("received SIGUSR2\n");
    else 
        err_dump("received signal %d\n", signo);
}
